Pseudocapacitive behavior of 2D molybdenum titanium carbide MXene and polyaniline based nanocomposites electrodes

The synergetic effect of conducting polymer and MXenes-based electrodes can pave the way to achieve high specific capacitance, power density, and stability in supercapacitors. This work is a step towards the search for a new pseudocapacitive electrode material for high-performance supercapacitors, where double transition metal carbide (Mo 2 Ti 2 C 3 T x ) MXene is combined with polyaniline (PANI). A binary composite of Mo 2 Ti 2 C 3 T x and PANI was synthesized using an ex-situ oxidative polymerization technique. Structural, morphological, and compositional characterizations were performed using XRD, FESEM, EDX, and XPS, confirming successful composite formation. The electrochemical properties of the electrode material were analyzed using cyclic voltametry(CV), galvanostatic charge-discharge (GCD) measurements, and electrochemical impedance spectroscopy (EIS). The Mo 2 Ti 2 C 3 T x /PANI composite exhibited a high specific capacitance (C SP ) of 908.1 F g −1 at 1 Ag -1 , with an enhanced energy density of 45.4 Whkg −1 and power density of 300 W kg −1 , significantly outperforming pristine MXene. The Mo 2 Ti 2 C 3 T x /PANI composite demonstrated 80.2 % capacitance retention up to 3000 cycles. The electrochemical study indicates that the synergistic blend of Mo 2 Ti 2 C 3 T x and PANI improves the charge transport and storage properties, making the nanocomposite an attractive choice for a supercapacitor electrode material. • Synthesis of Mo 2 Ti 2 C 3 T x and polyaniline (PANI) composite using ex-situ oxidative polymerization technique. • Structural characterizations including XRD, FESEM, EDS, and XPS confirmed successful composite formation. • The Mo 2 Ti 2 C 3 T x /PANI composite delivered an enhanced specific capacitance of 908.1 Fg -1 at 1 Ag -1 . • The composite demonstrated 79.2% capacitance retention up to 3000 cycles.